Extraction and characterization of mixed phase KNO₂–KNO₃nanocrystals derived from flat-leaf green spinach

Abstract

Naturally available green spinach, which is a rich source of potassium, was used as the key ingredient to extract mixed-phase ferroelectric crystals of nitrite and nitrate derivatives (KNO 2 + KNO 3 ). The KNO 3 phase was found to be dominant for higher pH values, as revealed by the x-ray diffraction patterns. The characteristic optical absorption spectra exhibited intra-band π-π * electronic transitions, whereas Fourier transform infrared spectra exhibited characteristic N-O stretching vibrations. Differential scanning calorimetry revealed a broad endothermic peak at ∼121.8 • C, highlighting a transition from phase II to I via phase III of KNO 3 . Obtaining nanoscale ferroelectrics via the adoption of green synthesis is economically viable for large-scale production and possible application in ferroelectric elements/devices.

Bio‐modified pyrotechnic composite materials for firefighting application

“…Polynuclear hydrocarbons marked its presence in condensed aerosol particulate matter of PFR‐KNO 3 ‐based traditional PyC by showing its characteristic absorption band at 2900–3200, 1646, 1441, 1361, 1244, 1208, 1052, 1001, 696, and 630 44 . XRD patterns (see Figure 9) of condensed aerosol particulate matter further confirmed the dominant phases present are potassium nitrite, potassium chloride, and potassium bicarbonate 41,45,46 …”

“…From FTIR spectra (Figure 8), common absorption bands 44 XRD patterns (see Figure 9) of condensed aerosol particulate matter further confirmed the dominant phases present are potassium nitrite, potassium chloride, and potassium bicarbonate. 41,45,46 X-ray energy spectrum and electron micrography of condensed aerosol particulate matter are shown in Figure 10. The elemental compositions determined from the X-ray energy spectrum, reported in Tables 8 and 9 show that oxygen, carbon, chlorine, and potassium were the main component elements commonly observed in all the condensed aerosol particulate samples.…”

Evaluation of small scale n‐heptane fire extinguishing efficacy by natural antioxidants based pyrotechnic compositions: An experimental study

“…XRD patterns of condensed aerosol particulate matter from pyrotechnic compositions PC‐A, B and C as shown in Figure 9, demonstrates the dominant phases present are of potassium bicarbonates, 29 potassium nitrite 30 and potassium chloride 31 …”